fix/query race condition

[euanwm]

Suspected there was a race condition happening with queries being cached simultaneously in the list of active queries so i've migrated the cacher to be thread safe. Improvements were also made so that partial caching / matching should no longer be required.

Also caught a silly bug with the total/sinclair query param.

[codecov]

Codecov Report

Attention: Patch coverage is 27.69231% with 47 lines in your changes missing coverage. Please review.

Project coverage is 64.65%. Comparing base (32e3d5b) to head (66f6819).
Report is 8 commits behind head on development.

Files with missing lines	Patch %	Lines
backend/dbtools/sortby.go	13.88%	31 Missing ⚠️
backend/dbtools/cache_handler.go	44.82%	15 Missing and 1 partial ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           development     #430      +/-   ##
===============================================
- Coverage        66.50%   64.65%   -1.86%     
===============================================
  Files               18       18              
  Lines              630      662      +32     
  Branches             5        5              
===============================================
+ Hits               419      428       +9     
- Misses             197      222      +25     
+ Partials            14       12       -2     

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